Illumination



June25, 1935. H NIN 2,006,140 I ILLUMINATION Filed Jan. 15, 1935 Pgl. II

[AZ-VENT UR WZ'LHELMHUNZNG' Hrs A'T'T'QRNEY UNITED "STATES PATENT OFFICEILLUDIINATION Wilhelm Honing, EindhovenrNetherlands, assignor to GeneralElectric Company, a corporation of New York Application January 13,1933, Serial No. 651,593

In Great Britain January 15, 1932 2 Claims. (Cl. 240-4125) My inventionrelates to illumination and more flecting shield l4, preferablysemi-spherical, is particularly to vehicle headlights and electriclocated therebelow. lamps therefor. Still more particularly my in-Referring to Fig. 1, the construction according vention relates to aheadlight having a lamp comto my invention comprises tilting thereflecting prising a bulb having a light source therein and a shield Iso that the plane .l-l passing through concave reflecting shielddisposed in juxtaposition the edge of the opening thereof intersects thetherewith to produce a desired beam pattern. axis I! of the reflectorIll at an acute angle, Electric lamps for headlights are known in whichpreferably about twelve degrees. This arrangea concave reflecting shieldis disposed below a ment provides abeam pattemas illustrated by l6filament within the buib, the plane in which the (Fig. 2) whichcomprises asector of less than 180, open edge of said shield lies beinghorizontally resulting in a decrease of the glaring eifect. The disposedin the coinciding axes of the reflector shield may be arranged so thatthe axis I3 of the and lamp, that is, the opening of the shield is lampand reflector does not intersect it, or it directed at right angles tothe said reflector and maybe placed in the said axis. Said shield may 5lamp axes. The said filament is disposed in adbe made reflecting or dulland have any desired vance of the focal point of the said reflector and,shape 'such as a trough or a hemispherical shape. by means ofthe saidshield located therebelow, a In Fig. l, the normal to the plane |-l liesin passing beam pattern is produced comprising a the vertical planepassing through the axis l3. In semi-circular cross section with a flattop to pre- Fi 3 th hi I4 is 50 arranged t t t vent glare above thehorizontal. A second fllaail to the plane passing through the edge ofment is e a y d sposed at t e focal point of the opening thereofintersects the said vertical said reflector to project the lightstraight down plane passing through the axis l3, that is, the e r0811Ordinary v g p p In 0011- shield opens out in a direction making anacute tradistinction to this known construction, the angle t saidvertical plane This arrangement beam w a cross section cofnprismg Sectorone of the radii 18 of the resulting sector makes h an angle smallerthan 180 tomslireagreat' an acute angle with the horizontal, while theer degree glarewlth the 01d other radius l9 extends horizontally. Thelimitof semi'cimular cross. section ing radius I8 is, of course, locatedon that side of glaring light is thrown in an approaching drivers themad upon which a vehicle is approaching, eyes when passmg' along madwhich is not thus materially eliminating glare on that side,

' tirely smooth, due to the bouncing of the car and consequent elevationof the entire beam. Acgigg the other slde of the road is fully m 28:35;2 335:531; iggggiz ggfiig f ggfi The construction represented by Fig. 3,is shown lamp as to provide the said pattern having across m 5 m whichthe filament 15 section of a sector of less than The light mounted onlead wires 2ll2l which are mounted in the 'upper portion of the quadrantin which on a stem press 22 in bulb 23 i g a base 24 the approachingdriver is located is thus elimimounted thereon The mament 15 mountednated, so that even if a rough road is encountered, on the end of leadand on another 40 said approaching driver will not be subjected to alead wire 25 which is also mounted on the stem glaring light. Furtherfeatures and advantages Press shield is mounted on of my invention willappear fromthe' following P Wire which is mounted on P lead wlredescription of species thereof. What I claim as new and desire to secureby In the drawing Fig. 1 is a diagrammatic eleva- Letters Patent 0f theUnited States is: tion of a headlight construction according to my Anelectric p p ising a bulb havi g a invention and Fig. 2 is the beampattern propair of light sources therein, one located ahead of ducedthereby; Fig. 3 is a diagrammatic elevation the other, and a concaveshield disposed below the of a modification and Fig. 4 is the beampattern foremost light Source w the normal to the produced thereby; andFig. 5 is an elevation plane in which the edge of said shield is locatedshowing in detail, the construction in Fig. 3. making an acute anglewith the horizontal plane Referring to the drawing, the headlamp'compassing through the longitudinal a of Sa d prises a parabolicreflector III with a filament ll lamp, and also making an acute anglewith the at the focal point thereof. A filament I2 is disperpendicularplane passing through said axis. posed ahead of the focal point, and aconcave re- 2. A vehicle headlamp comprising a reflector objec of theprese t i v ti is to provide produces the beam pattern n (Fig. 4) inwhich 25 r cated making an alcute angle with the horizontal J planepassing through the axis of said reflector. and also making an acuteangle with the perpendicular plane passing through said reflector axis,said shield being open toward the upper rear portion of said reflector.

WILHEIM I-IONING.

